Furnace.



W. MOGLAVE.

FURNAGB.

APPLIUATION FILED MAY 27, 1910.

Patented Mar. 28, 1911.

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Patented Mar.28, 1911.

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FURNACE APPLIUATION FILED MAY 27, 1910. 1 988,123. Patented Man-28,1911,

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UNITE El STARS PATENT @Fltlifi.

WILLIAM MCGLAVE, OF SGRANTON, PENNSYLVANIA, ASSIGNOR TO MoCLAVE-BROOKS COMPANY, OF SCRANTON, JPENNSYLVANIA, A. GGBPGRATION OF PENNSYLVANIA.

FURNACE.

Specification of Letters Patent.

Patented Mar. 28, 1911.

Application filed May 27, 1910. Serial No. 563,751.

To all whom it may comm.-

Be it known that I, VILLIAM MoCLAvn, a citizen of the United States, residing at Scranton, in the county of Lackawanna and State of Pennsylvania, have invented certain new and useful Improvements in Furnaces; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in furnaces, and particularly to an improved fire door and hopper gate or valve arrangement, together with associated parts for distributing heated air at the upper part of the fire chamber, and for maintaining in a proper cooled condition the various metallic parts of the furnace.

The object in view is the arrangement in a furnace, of improved fuel feeding means which permitmeasured quantities of fuel to be inserted into the furnace and distributed manually with hand tools.

A further object of the invention is the arrangement in a furnace, of a dead plate arranged as a continuation of the bottom of the door opening of the furnace, in combination with a pivotally mounted door for closing the door opening, the door being arranged to be freely moved for permitting fuel deposited on the dead plate to be forced intothe furnace and distributed over the grate thereof manually.

Another object of the invention is the arrangement in a furnace of a feeding hopper arranged inproximity to the door of the furnace having a pivotally mounted gate arranged to act in a proper relationship to the door for closing the furnace door opening, whereby charges -of fuel may be deposited on the deadplate arranged opposite the door of the furnace previous to its insertion and distribution over the furnace grate. I s w A still further object of the invention is the arrangement in a furnace, of cooling means for maintaining the dead plate, furnace grate, and associated parts, including the expansion blocks which support the gate, in a sufficiently cooled condition for properly fulfilling their various functions regardless of the heat in the fire chamber of the furnace.

Another objectof the invention is the arrangement of cooling means for the various operating parts of the furnace grate and hopper gate or valve, and means for distributing air from the cooling means to the upper part of the fire chamber in a plurality of jets, said jets being heated to a high temperature at the time of discharge, or to let such heated air escape into the surrounding atmosphere, as circumstances may requlre.

With these and other objects in view the invention comprises certain novel constructions, combinations, and arrangement of parts as will be hereinafter more fully described and claimed.

I In the accompanying drawings: Figure l is a fragmentary longitudinal sectional view through a furnace disclosing an embodiment of the invention. Fig. 2 is a front view of the structure shown in Fig. 1. Fig. 3 is a plan view of the furnace door. Fig. t is a fragmentary plan view of a guard plate for the furnace door. Fig. 5 is a section through Fig. 1 on line 5-5. Fig. 6 is a fragmentary perspective view of a packing member used in connection with the feeding hopper. Fig. 7 is a sectional view through the fire door and through the hopper gate or valve, the same being shown in an open position and with the surrounding parts. Fig. 8 is a plan view of the dead plate and associated parts. Fig. 9 is a fragnientary sectional view through Fig. 8 on line 99 thereof, the same being shown on an enlarged scale. Fig. 10 is a fragmentary sectional view through Fig. 8 approximately on line 1010.

In constructing a furnace embodying the invention in its most complete form, a pair of spaced arches are provided, one of which is arranged with a plurality of perforations for feeding air from the space between the arches to the fire chamber, the space between the arches being preferably supplied with air from a suitable fan or blower which maintains a proper pressure in the space between the arches for giving a proper blast to the jets of air. Associated with the arches of the fire chamber is any desired kind of grate, preferably a dumping grate, arranged to be dumped in sectiellsiiio that the unburned fuel may be moved to one section of the grate, and then the ashes dumped from part of the grate, after which the unburned fuel is moved to the cleaned section and the remaining section or sections dumped, after which the fire is distributed and the fuel added. The fire chaml er of the furnace is arranged with an opening of any desired size and length for properly admitting fuel to the furnace. This door opening is provided with a dead plate arranged with fire bricks along one edge and expansion blocks, upon which rests the pivotally mounted door which normally maintains closed the opening to the furnace. Associated with the furnace door and dead plate is a hopper having a gate or valve which is designed to be opened for permitting the discharge from the hopper of any desired amount of fuel onto the dead plate, which fuel is then forced into the furnace manually and distributed as desired over the grate. By this arrangement it will be observed that the feeding of fuel to the furnace is semi-automatic; that is, the fuel is fed automatically to the entrance of the furnace, and is then distributed by a hoe or other implement over the grate for maintaining an even bed of coal.

In order that the invention may be more clearly understood reference is had to the accompanying drawings, in which 1 indicates a furnace, and 2 the fire box or chamber thereof. A grate, preferably of the dumping type 3 is arranged at the bottom of the fire box or chamber 2, while, in the preferred embodiment, the top of the fire box comprises arches at and 5 which are spaced apart for providing an air heating chamber (3. Fire box or chamber 2 is provided with an opening or doorway 7 which is adapted to be closed by a door 8. Door 8 may be of any desired length, but preferably of a sufficient length for permitting one person to operate the same easily. If it is desired several doors may be provided for the furnace arranged in line, as shown more clearly in Fig. 7, so as to provide a freely operable door and one that will per mit a proper distribution of fuel into the furnace.

The door 8 is provided with a metallic shell 9 which may be of cast metal and to which is secured a plurality of fire bricks 10 by suitable bolts 11. Metallic shell or backing 9 is provided with ears or projecting members 12 and 13 which have extending therefrom tubular bearings 14 and 15 which rest in suitable bearing plates 16 and 17 of the furnace. The backing or shell 9 is also provided with flanges 18 and 19 at the ends for properly guiding the end bricks 10, so that the same may move properly in cut out portions 20 and 21 in the walls of the furmnace. As will be observed in Fig. 7 the door 8 sli 'htl longer than the 0 oening 7 in s Y r 1 order that the ends of the door may pro ect into notched out portions 20 and 21, whereby heat is prevented from passing through at the juncture of the furnace and the door.

The bricks 10 of door 8 are held in place by overturned portions 22 and 23, and also by the bolts 11 which are protected from the fire of the furnace by having fire resisting clay or other material placed above the ends thereof.

fhe metallic backing or shell 9 is pro vided with a plurality of slots or cuts 2% for accommodating the contraction and expansion of the metal. In order to assist in making a tight joint a substantially 'l' shaped iron 25 is bolted or otherwise rigidly secured to the shell or backing 9 and provided with a smooth face struck on the same are as the bricks 10 for accommodating a pivotally mounted guard plate or air sealing apron 26 (Figs. 1, f and This guard plate is formed of a continuous sheet of strip metal 27 having a plurality of slots 28 which define fingers which support a protecting strip 29. Plate 26 is pivoted at 30, and rests by gravity on member and thereby prevents any heat from escaping from the furnace to tne outside atmosphere. Pl ate 29 extends over the ends of the fingers formed on plate 26, and normally acts as means for preventing the entrance of air around the door when the door is closed, but keeps clean the inner face of the door, so that the door may be permitted an easy free movement at all times upon the actuation of its weighted lever 31. The guard plate or "air sealing apron 26 is designed to .eal the door 8 when the same is closed, and prevent the entrance of air between the door and the front wall of the furnace. The weight applied to the lever 31 is preferably normally such as to merely counterbalance the weight of the door so that the door 8 will. remain in any position in which it is placed, but may be changed or adjusted to change such counter-balancing relation. The tubular bearing 15 of door 8 has formed on its outer end a polygonal shaped portion for fitting into a correspondingly shaped aperture in lever 31.

Arranged at a convenient point in front of the furnace is a feeding hopper 32 which receives its supply of fuel from the bunkers through chute Hopper 32 is designed to be of substantially the same length as the opening 7, and is normally closed by a gate or valve 34. The hopper 82 is braced by suitable ridges or raised portions, some of which extend beyond the hopper, as shown at 35, for acting as a stop for the are shaped end 36 of gate 34. A convenient means for pivoting the door 8 and gate 34 is by mounting them concentrically, but such concentric pivoting is not essential to the present invention. End 36 is also provided with a stiffening and bracing member 37. In order to make a tight joint and to keep the upper edge of end 36 clean and loosely mounted, packing member 88, (Fig. 6) is arranged in a hollowed out portion 39. The packing SS is preferably formed of a plurality of metallic blocks so as to independently follow the contour of end 34, and keep thesame clean, and yet provide a tight joint at all times for preventing the spilling of any fuel when not desired. Gate 3a is arranged with ears or extensions 40 and ll which have projecting therefrom stub shafts =12 and 13, which are loosely journaled in the sleeves 1a and 15 =of door 8. Stub shaft 43 is slightly longer than sleeve 15, and is formed at its outer end polygonal in shape for receiving the operating lever 4a, which has an aperture corresponding in shape, VVhenever lever is moved, as indicated by the arrow in Fig. 1, gate 341 is opened against the action of the retractile spring 45, but immediately upon the release of lever 44, spring 45 will move it to a closed position. In this way the hopper 32 is maintained closed unless positively opened, while door 8 remains either opened or closed or in any intermediate position according to the desire of the operator.

Arranged beneath hopper 3-2 is a shelf or table 46,commonly known as a dead plate, upon which are mounted a plurality of expansion blocks 17, and also a plurality of fire bricks 48'. The dead plate 46 is arranged with a fuel receiving portion 49 which is in line with the upper edge of the expansion blocks 47 and with the upper edge of the bricks 48, so that a hoe or other implement may be used for pushing fuel into the fire box or chamber and properly distributing the same. The dead plate 46 is formed with a hollowed out portion 50 which is provided with apertures 51 and 52 which permit a free circulation of air beneath the expansion blocks for maintaining the same in a substantially cooled condition. The expansion blocks a7 are arranged with blocks 53 and 54: alternately for the full length of the dead plate, The expansion blocks also are each provided with a depending portion 55,

which has a notched edge for fitting into a suitable notched edge or projection 56 ex"- tending upward from dead plate e6. Blocks 53 are each formed with an enlargement 57 into which is cast the end of a bolt 58, which receives a suitable nut 59 at the outer end for clamping the block in position, which in turn holds blocks 54: in position by engaging the flange or beads 60 and 61 formed thereon. From this it will be observed that every other block is firmly bolted in position, but all of the blocks are positively held from removal unless one of the bolts 58 is removed. By this construction and arrangement any particular block may be removed for repair, renewal, or any other purpose without disturbing the remaining blocks.

Arranged above door 8, and between hopper 32 and the furnace, is an air chamber 62 which is supplied with air through pipe 63, by any ordinary and convenient means, and the metal walls of chamber '62 will be cooled thereby. The air from chamber 62 passes freely into the space 6 mrough aperture 6a, and, in the embodin'i'ent shown at Fig. 1, is heated to a "high degree in the space 6 between the arches .4 and 5, previous to its escape in jets through apertures '65 in arch a. In this way the air supplied by pipe 63 performs a double function, namely, the cooling of the various parts near the front of the furnace, and the supplying of heated air to the upper part of the fire box or chamber at a suitable temperature for causing a proper chemical union with the heated gases arising from the fuel.

\Vhen it is desired to feed fuel to the furnace, door 8 is opened and then gate 3 1 is opened. Immediately upon the opening of gate 34 against the action of spring 4-5 the fuel will pass downward from hopper 32 on dead plate 46. When a sufficient charge has been placed on dead plate l6 handle or lever 4a is rel-eased and gate 3% will a'uto m'atically close. The fuel on dead plate at) is then forced with a hoe or other implement into the furnace and distributed as desired. If a further supply of fuel is desired the operation is repeated until a suffi'cient supply has been provided for the fu'raa'ce. The door 8 and gate 3 1 and associated parts and surrounding constructions are designed to be i used as a unit of such a size that one person may easily operate the parts as desired, and if necessary to form only a section of a furnace. If a larger furnace is necessary two or more gates may be provided in alinement, as shown in Figs. 2 and 7-, each gate and associated constructions being provided with independent operating handles, as ll, and weighted levers, as 31. In this manner one operator may properly attend to a large furnace, and maintain an even temperature at all times with a minimum consumption of fuel. After one section of furnace has been supplied with fuel or cleaned, or otherwise served, the door thereof may be closed and the next section of furnace may be served or passed by as occasion may demand. In this way each gate and associated constructions are independent or may be built up as a plurality of units but defining a single furnace, and if desired may open above a single grate surface so that, though a plurality of doors may be used, only a single bed of coals will be provided.

WVhat I claim is:

1. In a furnace provided with a fire chamber, a fuel hopper, a compression chamber formed between the hopper and furnace in free communication with said fire chamber and with the atmosphere, whereby air is continuously supplied to said fire chamber,

said compression chamber being adapted to protect said hopper from heat and to utilize heat radiating from the furnace for heating the air previous to its entrance into said fire chamber, and a door for said fire chamber arranged between the door opening of said fire chamber and the discharge opening of said fuel hopper, and in proximity to said compression chamber, and adapted to have the heat thereof reduced by the air in said compression chamber.

2. In a furnace formed with a lire chamber having a fuel opening, a dead plate arranged in line with the bottom of the fuel opening, a row of fire bricks arranged along one edge of the dead plate, a plurality of expansion blocks arranged along one of said fire bricks, and a pivotal]; mounted door arranged to have one edge rest on said expansion blocks when in closed position.

3. In a furnace formed with fire chamber having a fuel opening, a dead plate arranged in line with said opening and formed with a depressed portion, a row of fire bricks arran,.,, 1 along one edge of the dead plate, and filling part of said depressed portion, a row of expansion blocks aaanged along the edge of said fire bricks and spaced from the bottom of said depressed portion for defining acooling chamber, said. depressed portion being formed with a plurality of openings for providing a circulation of air for maintaining said expansion blocks in a substantially cooled condition, and door for said fuel opening adapted to restagainst said expansion blocks when the door is closed.

1-. In a furnace formed with a fire chamher having a fuel opening, a door for closing said opening, a fuel hopper formed with a discharge opening near said fuel opening, a pivotally mounted gate arranged to norreally close the opening in said fuel hopper, and a plurality of loosely mounted recipro seams cating blocks arranged to press against the surface of the face of the gate which on gages the fuel for cleaning the same, and packing the joint between the gate and the hopper.

5. In a furnace formed with a fire chamber having a fuel opening, a door for closing said opening, and a pivotally mounted air sealing apron resting against said door and co-aoting therewith, said apron comprising a plate having its outer edge formed into a plurality of fingers and having sc cured to one side of each of said fingers a covering strip, said apron co-acting with the face of said door for preventing the admission of air when the door is closed.

6. In a furnace formed with a fire chamber having a fuel opening, fuel. door for normally closing said opening, a fuel hopper, a yieldable diagonally hung air sealing apron, means for pivotally supporting said apron at one edge to said hopper, so that the other edge thereof will rest against the face of said door and pliably conrorn'i to the expansion of said door for sealing the door against the admission of air to the furnace when the door is closed.

7. In a furnace formed with a fire chamber having a fuel opening, a fuel door for normally closing said fuel opening, a yieldable air sealing apron, and means for supporting said apron, said apron resting against the face of said door and pliably conforming to the expansion of said door and thereby sealing said door against the admission of air to the furnace when the door is closed.

In testimony whereof I aflix my signature in presence of two witnesses.

lVlLLIAli l McGLl-rVE.

G. M. l VATsoN.

Copies of this patent may he obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

